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• W2118614614 abstract "SUMMARY We studied the mechanical properties of deep red aerobic muscle of yellowfin tuna (Thunnus albacares), using both in vivo and in vitro methods. In fish swimming in a water tunnel at 1–3 L s–1 (where L is fork length), muscle length changes were recorded by sonomicrometry, and activation timing was quantified by electromyography. In some fish a tendon buckle was also implanted on the caudal tendon to measure instantaneous muscle forces transmitted to the tail. Between measurement sites at 0.45 to 0.65 L, the wave of muscle shortening progressed along the body at a relatively high velocity of 1.7 L per tail beat period, and a significant phase shift(31±4°) occurred between muscle shortening and local midline curvature, both suggesting red muscle power is directed posteriorly, rather than causing local body bending, which is a hallmark of thunniform swimming. Muscle activation at 0.53 L was initiated at about 50° of the tail beat period and ceased at about 160°, where 90° is peak muscle length and 180° is minimum length. Strain amplitude in the deep red fibres at 0.5 L was ±5.4%, double that predicted from midline curvature analysis. Work and power production were measured in isolated bundles of red fibres from 0.5 L by the work loop technique. Power was maximal at 3–4 Hz and fell to less than 50% of maximum after 6 Hz. Based on the timing of activation, muscle strain, tail beat frequencies and forces in the caudal tendon while swimming, we conclude that yellowfin tuna,like skipjack, use their red muscles under conditions that produce near-maximal power output while swimming. Interestingly, the red muscles of yellowfin tuna are slower than those of skipjack, which corresponds with the slower tail beat frequencies and cruising speeds in yellowfin." @default.
• W2118614614 created "2016-06-24" @default.
• W2118614614 creator A5012773550 @default.
• W2118614614 creator A5064671153 @default.
• W2118614614 date "2008-05-15" @default.
• W2118614614 modified "2023-10-15" @default.
• W2118614614 title "Thunniform swimming: muscle dynamics and mechanical power production of aerobic fibres in yellowfin tuna (<i>Thunnus albacares</i>)" @default.
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• W2118614614 doi "https://doi.org/10.1242/jeb.013250" @default.
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